Docker Interview Questions and Answer Part – 32

Which of the following are true about Docker volumes?

• They must exist on a SAN or NAS
• They are decoupled from containers (Ans)
• They are higher performance than graph driver (snapshotter) storage
• They are RAID protected

Which of the following commands will list all of the Docker volumes on a particular Docker host?

• docker system info | grep volumes
• docker node volumes
• docker volume ls (Ans)

Which of the following can be a Docker Secret?

• Just SSH keys
• Just .pem and .crt files
• Passwords less than 100KB
• Passwords, SSH keys, service ports and names (Ans)

Which component of the Docker Engine interfaces with the kernel primitives that are used to build containers?

• The OCI layer (runc) (Ans)
• The REST API
• The Docker daemon

What currently replaces containerd and the OCI layer in the Docker Engine on the Windows platform?

• The smss process
• The Compute Services Layer (Ans)
• The Windows Registry
• Hyper-V

How do you tell Docker on Windows to deploy a container as a Hyper-V container?

• Build the image with the isolation=hyperv tag
• Use the hyper-v container run command instead of the docker container run command
• Pass the docker container run command the --isolation=hyperv switch (Ans)

What are some of the features of Docker Universal Control Plane?

• Docker Content Trust (DCT)
• Management of containers and virtual machines via a single web UI
• RBAC, image scanning, image promotions (Ans)

Which of the following explains the relationship between a Docker image and a Docker container?

• A Docker container is two or more images that share a common execution environment
• A Docker container is used to start a Docker image
• A Docker container is a collection of image layers
• A Docker container is a running instance of an image (Ans)

Which of the following commands will initialize a new Swarm on the current node?

• docker swarm init (Ans)
• docker swarm create
• docker init

Which Dockerfile instruction sets the default program for a container to run, but can be overridden on the CLI at runtime?

• ENTRYPOINT
• RUN
• CMD (Ans)

Where do you specify the default logging driver for all containers on a particular Docker host?

• logs.json
• daemon.json
• The Registry
• config.json (Ans)

What underlying Windows technology, used to build containers, is broadly referred to as control groups?

• The Registry
• Hyper-V
• Active Directory
• Job objects (Ans)

Which of the following Docker Engine components is part of the Open Container Initiative (OCI)?

• runc (Ans)
• containerd
• The API
• The daemon

Which component of the Docker Engine implements the Docker API?

• The Docker daemon (Ans)
• The Docker client
• The OCI layer
• containerd

Which of the following is needed to deploy a Docker Stack?

• Compose v2 file format
• Kubernetes
• Compose v3 file format (Ans)
• Docker Cloud

What is the name of the configuration file that describes how to build a new Docker image with your app-code inside?

• dockerfile (Ans)
• config.json
• docker-file
• dockerfile.json

Which of the following is the worst number of managers for high availability?

• 1
• 5
• 2 (Ans)
• 7

Which command can you use to get a shell session inside of a container?

• docker container login
• docker container exec (Ans)
• docker container shell
• docker container ssh

Which Docker EE technology performs layer-7 (application layer) load balancing?

• The ingress network
• The Service Mesh
• The HTTP Routing Mesh (HRM) (Ans)

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.